kvm: add stubs for arch specific debugfs support

Two stubs are added:

 o kvm_arch_has_vcpu_debugfs(): must return true if the arch
   supports creating debugfs entries in the vcpu debugfs dir
   (which will be implemented by the next commit)

 o kvm_arch_create_vcpu_debugfs(): code that creates debugfs
   entries in the vcpu debugfs dir

For x86, this commit introduces a new file to avoid growing
arch/x86/kvm/x86.c even more.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 75f130e..c638935 100644 (file)
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -144,6 +144,16 @@ out_fail_alloc:
        return ret;
 }
 
+bool kvm_arch_has_vcpu_debugfs(void)
+{
+       return false;
+}
+
+int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
+{
+       return 0;
+}
+
 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 {
        return VM_FAULT_SIGBUS;

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index a6ea084..49b25e7 100644 (file)
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -140,6 +140,16 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
        return 0;
 }
 
+bool kvm_arch_has_vcpu_debugfs(void)
+{
+       return false;
+}
+
+int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
+{
+       return 0;
+}
+
 void kvm_mips_free_vcpus(struct kvm *kvm)
 {
        unsigned int i;

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 0b7d664..70963c8 100644 (file)
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -438,6 +438,16 @@ err_out:
        return -EINVAL;
 }
 
+bool kvm_arch_has_vcpu_debugfs(void)
+{
+       return false;
+}
+
+int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
+{
+       return 0;
+}
+
 void kvm_arch_destroy_vm(struct kvm *kvm)
 {
        unsigned int i;

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index ac6c056..0a9ce9d 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -1489,6 +1489,16 @@ out_err:
        return rc;
 }
 
+bool kvm_arch_has_vcpu_debugfs(void)
+{
+       return false;
+}
+
+int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
+{
+       return 0;
+}
+
 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
        VCPU_EVENT(vcpu, 3, "%s", "free cpu");

diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index 464fa47..3bff207 100644 (file)
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -13,7 +13,7 @@ kvm-$(CONFIG_KVM_ASYNC_PF)    += $(KVM)/async_pf.o
 
 kvm-y                  += x86.o mmu.o emulate.o i8259.o irq.o lapic.o \
                           i8254.o ioapic.o irq_comm.o cpuid.o pmu.o mtrr.o \
-                          hyperv.o page_track.o
+                          hyperv.o page_track.o debugfs.o
 
 kvm-$(CONFIG_KVM_DEVICE_ASSIGNMENT)    += assigned-dev.o iommu.o
 

diff --git a/arch/x86/kvm/debugfs.c b/arch/x86/kvm/debugfs.c
new file mode 100644 (file)
index 0000000..bb5e9f6
--- /dev/null
+++ b/arch/x86/kvm/debugfs.c
@@ -0,0 +1,20 @@
+/*
+ * Kernel-based Virtual Machine driver for Linux
+ *
+ * Copyright 2016 Red Hat, Inc. and/or its affiliates.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+#include <linux/kvm_host.h>
+
+bool kvm_arch_has_vcpu_debugfs(void)
+{
+       return false;
+}
+
+int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
+{
+       return 0;
+}

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 9c28b4d..5486ff9 100644 (file)
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -749,6 +749,9 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu);
 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
 
+bool kvm_arch_has_vcpu_debugfs(void);
+int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu);
+
 int kvm_arch_hardware_enable(void);
 void kvm_arch_hardware_disable(void);
 int kvm_arch_hardware_setup(void);